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arXiv · 2312.06903

Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at $^{133}$Te

A. A. Valverde·F. G. Kondev·B. Liu·D. Ray·M. Brodeur·D. P. Burdette·N. Callahan·A. Cannon·J. A. Clark·D. E. M. Hoff·R. Orford·W. S. Porter·K. S. Sharma·L. Varriano
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Abstract

We report precision mass measurements of $^{133}$Sb, $^{133g,m}$Te, and $^{133g,m}$I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Canadian Penning Trap mass spectrometer. These masses clarify an anomaly in the $^{133}$Te $β$-decay. The masses reported in the 2020 Atomic Mass Evaluation (M. Wang et al., 2021) produce $Q_{β^-}(^{133}$Te)=2920(6) keV; however, the highest-lying $^{133}$I level populated in this decay is observed at $E_i=2935.83(15)$ keV, resulting in an anomalous $Q_{β^{-}}^{i}=-16(6)$~keV. Our new measurements give $Q_{β^-}(^{133}\text{Te})=2934.8(11)$ keV, a factor of five more precise, yielding $Q{_β^i}=-1.0(12)$~keV, a 3$σ$ shift from the previous results. This resolves this anomaly, but indicates further anomalies in our understanding of the structure of this isotope.

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A. A. Valverde, F. G. Kondev, B. Liu, D. Ray, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, R. Orford, W. S. Porter, K. S. Sharma, L. Varriano. 2024-08-15. Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at $^{133}$Te. https://doi.org/10.1016/j.physletb.2024.139037

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